xref: /freebsd/sys/geom/geom_dev.c (revision 325151a3)
1 /*-
2  * Copyright (c) 2002 Poul-Henning Kamp
3  * Copyright (c) 2002 Networks Associates Technology, Inc.
4  * All rights reserved.
5  *
6  * This software was developed for the FreeBSD Project by Poul-Henning Kamp
7  * and NAI Labs, the Security Research Division of Network Associates, Inc.
8  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
9  * DARPA CHATS research program.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  * 3. The names of the authors may not be used to endorse or promote
20  *    products derived from this software without specific prior written
21  *    permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  */
35 
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38 
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/malloc.h>
42 #include <sys/kernel.h>
43 #include <sys/conf.h>
44 #include <sys/ctype.h>
45 #include <sys/bio.h>
46 #include <sys/bus.h>
47 #include <sys/lock.h>
48 #include <sys/mutex.h>
49 #include <sys/proc.h>
50 #include <sys/errno.h>
51 #include <sys/time.h>
52 #include <sys/disk.h>
53 #include <sys/fcntl.h>
54 #include <sys/limits.h>
55 #include <sys/sysctl.h>
56 #include <geom/geom.h>
57 #include <geom/geom_int.h>
58 #include <machine/stdarg.h>
59 
60 struct g_dev_softc {
61 	struct mtx	 sc_mtx;
62 	struct cdev	*sc_dev;
63 	struct cdev	*sc_alias;
64 	int		 sc_open;
65 	int		 sc_active;
66 };
67 
68 static d_open_t		g_dev_open;
69 static d_close_t	g_dev_close;
70 static d_strategy_t	g_dev_strategy;
71 static d_ioctl_t	g_dev_ioctl;
72 
73 static struct cdevsw g_dev_cdevsw = {
74 	.d_version =	D_VERSION,
75 	.d_open =	g_dev_open,
76 	.d_close =	g_dev_close,
77 	.d_read =	physread,
78 	.d_write =	physwrite,
79 	.d_ioctl =	g_dev_ioctl,
80 	.d_strategy =	g_dev_strategy,
81 	.d_name =	"g_dev",
82 	.d_flags =	D_DISK | D_TRACKCLOSE,
83 };
84 
85 static g_init_t g_dev_init;
86 static g_fini_t g_dev_fini;
87 static g_taste_t g_dev_taste;
88 static g_orphan_t g_dev_orphan;
89 static g_attrchanged_t g_dev_attrchanged;
90 
91 static struct g_class g_dev_class	= {
92 	.name = "DEV",
93 	.version = G_VERSION,
94 	.init = g_dev_init,
95 	.fini = g_dev_fini,
96 	.taste = g_dev_taste,
97 	.orphan = g_dev_orphan,
98 	.attrchanged = g_dev_attrchanged
99 };
100 
101 /*
102  * We target 262144 (8 x 32768) sectors by default as this significantly
103  * increases the throughput on commonly used SSD's with a marginal
104  * increase in non-interruptible request latency.
105  */
106 static uint64_t g_dev_del_max_sectors = 262144;
107 SYSCTL_DECL(_kern_geom);
108 SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW, 0, "GEOM_DEV stuff");
109 SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW,
110     &g_dev_del_max_sectors, 0, "Maximum number of sectors in a single "
111     "delete request sent to the provider. Larger requests are chunked "
112     "so they can be interrupted. (0 = disable chunking)");
113 
114 static char *dumpdev = NULL;
115 static void
116 g_dev_init(struct g_class *mp)
117 {
118 
119 	dumpdev = kern_getenv("dumpdev");
120 }
121 
122 static void
123 g_dev_fini(struct g_class *mp)
124 {
125 
126 	freeenv(dumpdev);
127 	dumpdev = NULL;
128 }
129 
130 static int
131 g_dev_setdumpdev(struct cdev *dev, struct thread *td)
132 {
133 	struct g_kerneldump kd;
134 	struct g_consumer *cp;
135 	int error, len;
136 
137 	if (dev == NULL)
138 		return (set_dumper(NULL, NULL, td));
139 
140 	cp = dev->si_drv2;
141 	len = sizeof(kd);
142 	kd.offset = 0;
143 	kd.length = OFF_MAX;
144 	error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd);
145 	if (error == 0) {
146 		error = set_dumper(&kd.di, devtoname(dev), td);
147 		if (error == 0)
148 			dev->si_flags |= SI_DUMPDEV;
149 	}
150 	return (error);
151 }
152 
153 static void
154 init_dumpdev(struct cdev *dev)
155 {
156 	const char *devprefix = "/dev/", *devname;
157 	size_t len;
158 
159 	if (dumpdev == NULL)
160 		return;
161 	len = strlen(devprefix);
162 	devname = devtoname(dev);
163 	if (strcmp(devname, dumpdev) != 0 &&
164 	   (strncmp(dumpdev, devprefix, len) != 0 ||
165 	    strcmp(devname, dumpdev + len) != 0))
166 		return;
167 	if (g_dev_setdumpdev(dev, curthread) == 0) {
168 		freeenv(dumpdev);
169 		dumpdev = NULL;
170 	}
171 }
172 
173 static void
174 g_dev_destroy(void *arg, int flags __unused)
175 {
176 	struct g_consumer *cp;
177 	struct g_geom *gp;
178 	struct g_dev_softc *sc;
179 	char buf[SPECNAMELEN + 6];
180 
181 	g_topology_assert();
182 	cp = arg;
183 	gp = cp->geom;
184 	sc = cp->private;
185 	g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name);
186 	snprintf(buf, sizeof(buf), "cdev=%s", gp->name);
187 	devctl_notify_f("GEOM", "DEV", "DESTROY", buf, M_WAITOK);
188 	if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
189 		g_access(cp, -cp->acr, -cp->acw, -cp->ace);
190 	g_detach(cp);
191 	g_destroy_consumer(cp);
192 	g_destroy_geom(gp);
193 	mtx_destroy(&sc->sc_mtx);
194 	g_free(sc);
195 }
196 
197 void
198 g_dev_print(void)
199 {
200 	struct g_geom *gp;
201 	char const *p = "";
202 
203 	LIST_FOREACH(gp, &g_dev_class.geom, geom) {
204 		printf("%s%s", p, gp->name);
205 		p = " ";
206 	}
207 	printf("\n");
208 }
209 
210 static void
211 g_dev_attrchanged(struct g_consumer *cp, const char *attr)
212 {
213 	struct g_dev_softc *sc;
214 	struct cdev *dev;
215 	char buf[SPECNAMELEN + 6];
216 
217 	sc = cp->private;
218 	if (strcmp(attr, "GEOM::media") == 0) {
219 		dev = sc->sc_dev;
220 		snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name);
221 		devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK);
222 		devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK);
223 		dev = sc->sc_alias;
224 		if (dev != NULL) {
225 			snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name);
226 			devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf,
227 			    M_WAITOK);
228 			devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf,
229 			    M_WAITOK);
230 		}
231 		return;
232 	}
233 
234 	if (strcmp(attr, "GEOM::physpath") != 0)
235 		return;
236 
237 	if (g_access(cp, 1, 0, 0) == 0) {
238 		char *physpath;
239 		int error, physpath_len;
240 
241 		physpath_len = MAXPATHLEN;
242 		physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO);
243 		error =
244 		    g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath);
245 		g_access(cp, -1, 0, 0);
246 		if (error == 0 && strlen(physpath) != 0) {
247 			struct cdev *old_alias_dev;
248 			struct cdev **alias_devp;
249 
250 			dev = sc->sc_dev;
251 			old_alias_dev = sc->sc_alias;
252 			alias_devp = (struct cdev **)&sc->sc_alias;
253 			make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp,
254 			    dev, old_alias_dev, physpath);
255 		} else if (sc->sc_alias) {
256 			destroy_dev((struct cdev *)sc->sc_alias);
257 			sc->sc_alias = NULL;
258 		}
259 		g_free(physpath);
260 	}
261 }
262 
263 struct g_provider *
264 g_dev_getprovider(struct cdev *dev)
265 {
266 	struct g_consumer *cp;
267 
268 	g_topology_assert();
269 	if (dev == NULL)
270 		return (NULL);
271 	if (dev->si_devsw != &g_dev_cdevsw)
272 		return (NULL);
273 	cp = dev->si_drv2;
274 	return (cp->provider);
275 }
276 
277 static struct g_geom *
278 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
279 {
280 	struct g_geom *gp;
281 	struct g_consumer *cp;
282 	struct g_dev_softc *sc;
283 	int error;
284 	struct cdev *dev;
285 	char buf[SPECNAMELEN + 6];
286 
287 	g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name);
288 	g_topology_assert();
289 	gp = g_new_geomf(mp, "%s", pp->name);
290 	sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
291 	mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF);
292 	cp = g_new_consumer(gp);
293 	cp->private = sc;
294 	cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
295 	error = g_attach(cp, pp);
296 	KASSERT(error == 0,
297 	    ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error));
298 	error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev,
299 	    &g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name);
300 	if (error != 0) {
301 		printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n",
302 		    __func__, gp->name, error);
303 		g_detach(cp);
304 		g_destroy_consumer(cp);
305 		g_destroy_geom(gp);
306 		mtx_destroy(&sc->sc_mtx);
307 		g_free(sc);
308 		return (NULL);
309 	}
310 	dev->si_flags |= SI_UNMAPPED;
311 	sc->sc_dev = dev;
312 
313 	dev->si_iosize_max = MAXPHYS;
314 	dev->si_drv2 = cp;
315 	init_dumpdev(dev);
316 
317 	g_dev_attrchanged(cp, "GEOM::physpath");
318 	snprintf(buf, sizeof(buf), "cdev=%s", gp->name);
319 	devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK);
320 
321 	return (gp);
322 }
323 
324 static int
325 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td)
326 {
327 	struct g_consumer *cp;
328 	struct g_dev_softc *sc;
329 	int error, r, w, e;
330 
331 	cp = dev->si_drv2;
332 	if (cp == NULL)
333 		return (ENXIO);		/* g_dev_taste() not done yet */
334 	g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)",
335 	    cp->geom->name, flags, fmt, td);
336 
337 	r = flags & FREAD ? 1 : 0;
338 	w = flags & FWRITE ? 1 : 0;
339 #ifdef notyet
340 	e = flags & O_EXCL ? 1 : 0;
341 #else
342 	e = 0;
343 #endif
344 
345 	/*
346 	 * This happens on attempt to open a device node with O_EXEC.
347 	 */
348 	if (r + w + e == 0)
349 		return (EINVAL);
350 
351 	if (w) {
352 		/*
353 		 * When running in very secure mode, do not allow
354 		 * opens for writing of any disks.
355 		 */
356 		error = securelevel_ge(td->td_ucred, 2);
357 		if (error)
358 			return (error);
359 	}
360 	g_topology_lock();
361 	error = g_access(cp, r, w, e);
362 	g_topology_unlock();
363 	if (error == 0) {
364 		sc = cp->private;
365 		mtx_lock(&sc->sc_mtx);
366 		if (sc->sc_open == 0 && sc->sc_active != 0)
367 			wakeup(&sc->sc_active);
368 		sc->sc_open += r + w + e;
369 		mtx_unlock(&sc->sc_mtx);
370 	}
371 	return (error);
372 }
373 
374 static int
375 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td)
376 {
377 	struct g_consumer *cp;
378 	struct g_dev_softc *sc;
379 	int error, r, w, e;
380 
381 	cp = dev->si_drv2;
382 	if (cp == NULL)
383 		return (ENXIO);
384 	g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)",
385 	    cp->geom->name, flags, fmt, td);
386 
387 	r = flags & FREAD ? -1 : 0;
388 	w = flags & FWRITE ? -1 : 0;
389 #ifdef notyet
390 	e = flags & O_EXCL ? -1 : 0;
391 #else
392 	e = 0;
393 #endif
394 
395 	/*
396 	 * The vgonel(9) - caused by eg. forced unmount of devfs - calls
397 	 * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags,
398 	 * which would result in zero deltas, which in turn would cause
399 	 * panic in g_access(9).
400 	 *
401 	 * Note that we cannot zero the counters (ie. do "r = cp->acr"
402 	 * etc) instead, because the consumer might be opened in another
403 	 * devfs instance.
404 	 */
405 	if (r + w + e == 0)
406 		return (EINVAL);
407 
408 	sc = cp->private;
409 	mtx_lock(&sc->sc_mtx);
410 	sc->sc_open += r + w + e;
411 	while (sc->sc_open == 0 && sc->sc_active != 0)
412 		msleep(&sc->sc_active, &sc->sc_mtx, 0, "PRIBIO", 0);
413 	mtx_unlock(&sc->sc_mtx);
414 	g_topology_lock();
415 	error = g_access(cp, r, w, e);
416 	g_topology_unlock();
417 	return (error);
418 }
419 
420 /*
421  * XXX: Until we have unmessed the ioctl situation, there is a race against
422  * XXX: a concurrent orphanization.  We cannot close it by holding topology
423  * XXX: since that would prevent us from doing our job, and stalling events
424  * XXX: will break (actually: stall) the BSD disklabel hacks.
425  */
426 static int
427 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
428 {
429 	struct g_consumer *cp;
430 	struct g_provider *pp;
431 	off_t offset, length, chunk;
432 	int i, error;
433 
434 	cp = dev->si_drv2;
435 	pp = cp->provider;
436 
437 	error = 0;
438 	KASSERT(cp->acr || cp->acw,
439 	    ("Consumer with zero access count in g_dev_ioctl"));
440 
441 	i = IOCPARM_LEN(cmd);
442 	switch (cmd) {
443 	case DIOCGSECTORSIZE:
444 		*(u_int *)data = cp->provider->sectorsize;
445 		if (*(u_int *)data == 0)
446 			error = ENOENT;
447 		break;
448 	case DIOCGMEDIASIZE:
449 		*(off_t *)data = cp->provider->mediasize;
450 		if (*(off_t *)data == 0)
451 			error = ENOENT;
452 		break;
453 	case DIOCGFWSECTORS:
454 		error = g_io_getattr("GEOM::fwsectors", cp, &i, data);
455 		if (error == 0 && *(u_int *)data == 0)
456 			error = ENOENT;
457 		break;
458 	case DIOCGFWHEADS:
459 		error = g_io_getattr("GEOM::fwheads", cp, &i, data);
460 		if (error == 0 && *(u_int *)data == 0)
461 			error = ENOENT;
462 		break;
463 	case DIOCGFRONTSTUFF:
464 		error = g_io_getattr("GEOM::frontstuff", cp, &i, data);
465 		break;
466 	case DIOCSKERNELDUMP:
467 		if (*(u_int *)data == 0)
468 			error = g_dev_setdumpdev(NULL, td);
469 		else
470 			error = g_dev_setdumpdev(dev, td);
471 		break;
472 	case DIOCGFLUSH:
473 		error = g_io_flush(cp);
474 		break;
475 	case DIOCGDELETE:
476 		offset = ((off_t *)data)[0];
477 		length = ((off_t *)data)[1];
478 		if ((offset % cp->provider->sectorsize) != 0 ||
479 		    (length % cp->provider->sectorsize) != 0 || length <= 0) {
480 			printf("%s: offset=%jd length=%jd\n", __func__, offset,
481 			    length);
482 			error = EINVAL;
483 			break;
484 		}
485 		while (length > 0) {
486 			chunk = length;
487 			if (g_dev_del_max_sectors != 0 && chunk >
488 			    g_dev_del_max_sectors * cp->provider->sectorsize) {
489 				chunk = g_dev_del_max_sectors *
490 				    cp->provider->sectorsize;
491 			}
492 			error = g_delete_data(cp, offset, chunk);
493 			length -= chunk;
494 			offset += chunk;
495 			if (error)
496 				break;
497 			/*
498 			 * Since the request size can be large, the service
499 			 * time can be is likewise.  We make this ioctl
500 			 * interruptible by checking for signals for each bio.
501 			 */
502 			if (SIGPENDING(td))
503 				break;
504 		}
505 		break;
506 	case DIOCGIDENT:
507 		error = g_io_getattr("GEOM::ident", cp, &i, data);
508 		break;
509 	case DIOCGPROVIDERNAME:
510 		if (pp == NULL)
511 			return (ENOENT);
512 		strlcpy(data, pp->name, i);
513 		break;
514 	case DIOCGSTRIPESIZE:
515 		*(off_t *)data = cp->provider->stripesize;
516 		break;
517 	case DIOCGSTRIPEOFFSET:
518 		*(off_t *)data = cp->provider->stripeoffset;
519 		break;
520 	case DIOCGPHYSPATH:
521 		error = g_io_getattr("GEOM::physpath", cp, &i, data);
522 		if (error == 0 && *(char *)data == '\0')
523 			error = ENOENT;
524 		break;
525 	case DIOCGATTR: {
526 		struct diocgattr_arg *arg = (struct diocgattr_arg *)data;
527 
528 		if (arg->len > sizeof(arg->value)) {
529 			error = EINVAL;
530 			break;
531 		}
532 		error = g_io_getattr(arg->name, cp, &arg->len, &arg->value);
533 		break;
534 	}
535 	default:
536 		if (cp->provider->geom->ioctl != NULL) {
537 			error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td);
538 		} else {
539 			error = ENOIOCTL;
540 		}
541 	}
542 
543 	return (error);
544 }
545 
546 static void
547 g_dev_done(struct bio *bp2)
548 {
549 	struct g_consumer *cp;
550 	struct g_dev_softc *sc;
551 	struct bio *bp;
552 	int destroy;
553 
554 	cp = bp2->bio_from;
555 	sc = cp->private;
556 	bp = bp2->bio_parent;
557 	bp->bio_error = bp2->bio_error;
558 	bp->bio_completed = bp2->bio_completed;
559 	bp->bio_resid = bp->bio_length - bp2->bio_completed;
560 	if (bp2->bio_error != 0) {
561 		g_trace(G_T_BIO, "g_dev_done(%p) had error %d",
562 		    bp2, bp2->bio_error);
563 		bp->bio_flags |= BIO_ERROR;
564 	} else {
565 		g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd",
566 		    bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed);
567 	}
568 	g_destroy_bio(bp2);
569 	destroy = 0;
570 	mtx_lock(&sc->sc_mtx);
571 	if ((--sc->sc_active) == 0) {
572 		if (sc->sc_open == 0)
573 			wakeup(&sc->sc_active);
574 		if (sc->sc_dev == NULL)
575 			destroy = 1;
576 	}
577 	mtx_unlock(&sc->sc_mtx);
578 	if (destroy)
579 		g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL);
580 	biodone(bp);
581 }
582 
583 static void
584 g_dev_strategy(struct bio *bp)
585 {
586 	struct g_consumer *cp;
587 	struct bio *bp2;
588 	struct cdev *dev;
589 	struct g_dev_softc *sc;
590 
591 	KASSERT(bp->bio_cmd == BIO_READ ||
592 	        bp->bio_cmd == BIO_WRITE ||
593 	        bp->bio_cmd == BIO_DELETE ||
594 		bp->bio_cmd == BIO_FLUSH,
595 		("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd));
596 	dev = bp->bio_dev;
597 	cp = dev->si_drv2;
598 	sc = cp->private;
599 	KASSERT(cp->acr || cp->acw,
600 	    ("Consumer with zero access count in g_dev_strategy"));
601 #ifdef INVARIANTS
602 	if ((bp->bio_offset % cp->provider->sectorsize) != 0 ||
603 	    (bp->bio_bcount % cp->provider->sectorsize) != 0) {
604 		bp->bio_resid = bp->bio_bcount;
605 		biofinish(bp, NULL, EINVAL);
606 		return;
607 	}
608 #endif
609 	mtx_lock(&sc->sc_mtx);
610 	KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy"));
611 	sc->sc_active++;
612 	mtx_unlock(&sc->sc_mtx);
613 
614 	for (;;) {
615 		/*
616 		 * XXX: This is not an ideal solution, but I belive it to
617 		 * XXX: deadlock safe, all things considered.
618 		 */
619 		bp2 = g_clone_bio(bp);
620 		if (bp2 != NULL)
621 			break;
622 		pause("gdstrat", hz / 10);
623 	}
624 	KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place"));
625 	bp2->bio_done = g_dev_done;
626 	g_trace(G_T_BIO,
627 	    "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d",
628 	    bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length,
629 	    bp2->bio_data, bp2->bio_cmd);
630 	g_io_request(bp2, cp);
631 	KASSERT(cp->acr || cp->acw,
632 	    ("g_dev_strategy raced with g_dev_close and lost"));
633 
634 }
635 
636 /*
637  * g_dev_callback()
638  *
639  * Called by devfs when asynchronous device destruction is completed.
640  * - Mark that we have no attached device any more.
641  * - If there are no outstanding requests, schedule geom destruction.
642  *   Otherwise destruction will be scheduled later by g_dev_done().
643  */
644 
645 static void
646 g_dev_callback(void *arg)
647 {
648 	struct g_consumer *cp;
649 	struct g_dev_softc *sc;
650 	int destroy;
651 
652 	cp = arg;
653 	sc = cp->private;
654 	g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name);
655 
656 	mtx_lock(&sc->sc_mtx);
657 	sc->sc_dev = NULL;
658 	sc->sc_alias = NULL;
659 	destroy = (sc->sc_active == 0);
660 	mtx_unlock(&sc->sc_mtx);
661 	if (destroy)
662 		g_post_event(g_dev_destroy, cp, M_WAITOK, NULL);
663 }
664 
665 /*
666  * g_dev_orphan()
667  *
668  * Called from below when the provider orphaned us.
669  * - Clear any dump settings.
670  * - Request asynchronous device destruction to prevent any more requests
671  *   from coming in.  The provider is already marked with an error, so
672  *   anything which comes in in the interrim will be returned immediately.
673  */
674 
675 static void
676 g_dev_orphan(struct g_consumer *cp)
677 {
678 	struct cdev *dev;
679 	struct g_dev_softc *sc;
680 
681 	g_topology_assert();
682 	sc = cp->private;
683 	dev = sc->sc_dev;
684 	g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name);
685 
686 	/* Reset any dump-area set on this device */
687 	if (dev->si_flags & SI_DUMPDEV)
688 		(void)set_dumper(NULL, NULL, curthread);
689 
690 	/* Destroy the struct cdev *so we get no more requests */
691 	destroy_dev_sched_cb(dev, g_dev_callback, cp);
692 }
693 
694 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
695